The manual position grounds through that brass spring that also acts as a retainer, so give it a clean and make sure it has good contact to the mounting metal. Surface rust or a tuck of roof liner can stop it working.
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1972 911T Coupe with a '73E MFI engine and 'S' pistons
10 year resto mostly completed, in original Albert Blue.
***If only I didn't know now what I didn't know then***
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